Yes, they did. It is time for a national death penalty moratorium. This is not the first time. This is a more straightforward read: http://en.wikipedia.org/wiki/Cameron_Willingham
How is this any worse than the collateral damage of war?
Capital punishment in it's current form is not a deterrence to crime, it doesn't fix the problems caused by the crimes it is punishing for (it doesn't bring back the murdered, etc), it's more expensive for the state (and therefore taxpayers) than life without parole, and innocents have died at the hands of overzealous police, judges, politicians, and public opinion. So the question then becomes, why do it?